Zabby lassor



v(No Model.)

Z. y LASSOR.

GHANNELING MAGHINB.

No. 471,797. Patented Mar. 29, 1892.

UNITED STATES PATENT OFFICE.

ZABBY LASSOR, OF STINESVILLE, INDIANA, ASSIGNOR OF TWO-THIRDS TO CHARLESC. DUNN AND FRANK MOORE, OF SAME PLACE. I

CHANNELING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 471,797, dated March29, 1892.

Application nea Mara 2s, 1891.

To @ZZ whom it may concern:

Be it known that I, ZABBY LAssoE, a citizen of the United States,residing in Stinesville, county of Monroe, and State of Indiana, haveinvented certain new and useful Improvements in Stone ChannelingMachines, of which the following is a specification.

This invention relates to improvements in stone-channelin g machineswhich travel back and forth over the stone to be channeled and producethe channel by theaction of cutters arranged and secured together ingangs; but my invention, however, is more especially directed toimprovements in thel clamping devices for rigidly securing together thecutters of a gang. These gangs of cutters operate by gravity-that is tosay, they are raised by power and dropped by gravity to strikesuccessive blows, whereby the channel is formed, and are, therefore,necessarily quite long, very heavy, and require correspondinglyponderous clamping-plates for holding them together when in operation.The clampingplate must not only hold the cutters, but guide them intheir descent, and to this end are vertically channeled to receive fixedguide-plates or trackways directing their movement, and, besides, mustbe so constructed as to provide for their connection with the devicesfor raising the cutter gangs in position to strike blows. As heretoforeconstructed, these clamps have been made in two parts, one part of whichmay be said to be the fixed jaw or main body of the clamp, and havingcast therein the guidechannels and projecting therefrom a lug forconnecting it with thelever or other device for elevating the cutters.The other part ofthe clamp constitutes the movable jaw thereof and issecured to the sliding but otherwise fixed jaw by bolts, which haveusually been passed through the movable jaw and screwed into the fixedjaw, so as to firmly clamp the gangs of cutters lyingbetween these twojaws. In the practical opertion of these machines, notwithstanding thevery strong and ponderous construction of these clamps, and owing to thesudden and violent jars they are subject to when the cutters are inoperation, these bolts fre- Serial No. 386,788. (No model.)

qnently break, and more frequently both the fixed jaw and the movablejaw are fractured and broken at their corners, where they are theweakest, because, as will be understood, the bolts must be at a point oneither side of the cutters and on a line passing through the channeledportion of the fixed clamping- Jaw.

The object of my invention is to provide an improved clamp which shallbe simple, durable, and effective, and in which the parts are soconstructed and arranged as to be capable of being readily and.conveniently put together or taken apart for repairs or renewal; and myinvention consists in certain features of novelty in the construction,arrangement, and combination of parts hereinafter described withreference to the accompanying drawings, and more particularly pointedout in the claims.

In the said drawings, Figure 1 illustrates a perspective view of so'muchof a stone-channeling machine as embodies my invention; Fig. 2, an innerface view of the base or back plate of the fixed but sliding jaw of myclalnp Fig. 3, a transverse section on the line 3 3 of Fig. 1, with theactuating-lever shown in full lines; Fig. 4, a similar but enlargeddetail view of the clamp with the cutters removed, and more particularlyillustrating the bolts and position thereof for locking the movable jawof the clamp to the fixed jaw for clamping the gang of cutters; Fig. 5,a front eleva- `tion of the fixed but slidingjaw of the clamp,

more particularly illustrating the arrangeverse section on the line 6 6of Fig. 3.

Similar letters and numerals of reference indicate the same parts in theseveral figures of the drawings.

A indicates a gang of cutters of the usual form and clamped togethertoward their upper ends by an ordinary clamp B, and bearing at theseends on the usual and ordinary face-plate C of the machines in whichsaid cutters are designed to be employed. Upon their rear sides andtoward their lower ends these cutters bear and slide upon afixedbedplate D, rearward of which is a revolving cam E, the purpose ofscribed.

The bed plate D is bolted in the usual manner to the frame of themachine and projects outwardly beyond and downwardly to within a shortdistance ofthe rails F, as shown, for the purposes of illustrating therela tive position of the bed-plate andl the cutters thereof, it beingunderstood that the track upon which the machine moves is a temporarytrack, and is usually so constructed as to be bodily laterally movablefor the purpose of transferring the machine to outa. new channel, thetrack governing the direction as to the line of the channel. Thebed-plate is provided with a slot, (see Fig. 3,) through which projectsa clamp G, provided on each side with channels embracing the bed-plate,which thereby forms a trackway guiding the clamp G and in turn thecutters while in' operation, thecutters being elevatedl by means of armse e, actuated by the cam E,and by reason of one'of said arms working ina rear- Wardly-projecting lug g of the clamp.v As heretoforeconstructed, these'clamps have consistedof but two parts orcasingsw-namely, they movable or clamping jaw andthe slidingor'otherwise fixed jaw4the fixed jaw having which will presently be decast'therein a' channel embracing the' slotted' walls'of the bed-plate.

TheV result of castingv the fixed jaw in one piece,` as has already beenintimated, results inthe total loss of that jaw should any part of it bebroken', asv frequently happens, and as this breakage usually occursthrough its iiange or lip embracing the outer side of the' bed-plate itis one purpose of my invention to so construct this iiXed'j aw thatonlya portion of it is lost byy such breakage, and at the'same timeto'have saidjaw as rigid and du'rable'a's thoughvcast in onepiece. Tothese en'd's the fixed jaw is cast or constructed in two pieces, whichfor the purposes of clearness will be described as the base-plate 3 andthe faceplate 2; The base-plate 3 has integral therewith the lug g,before described, and formed in its face a dovetail groove. Theface-plate has formed therewith a rib or tenon conforming to the groove'in the base=plate, said groove v and tenonl preferably tapering to wardone endl, `so that the two parts may be wedged tightly together, theface-plate hav ing at its rear side an offset and forming the bottom andfrontwall of the groove or channel embracing the bed-plate D, thestraight edge of the kbase-plate forming the other wall. To promote thelocking of vthe base and face plates of this sliding but otherwise IiXedjaw of the clamp and to insure them against any possibility of movingupon each other after being united and in their operative position, apin'- 4 vis projectedk through the base-'plate and the tongue or tenonof the face-plate; but any other form of key may answer the samepurpose, although in any event it should be of such a character thatwhile securely locking the two parts together it may be removed when forany reason it is desirable to separate them.

With the iiXed jaw ofthe clamp constructed inthe above-.described mannerit will be seen lby an inspection of Fig. 3 that should the :face-platebecome injured it may be removed from the base-plate by raising orlowering jthe clamp out of one end of the slot in the bed-plate,removing the pin 4, sliding the face-plate off of the base-plate, and asreadily `and quickly substituting a new face-plate.

In order that the movable or grippingjaw of the clamp, whichis securedto the nXed jaw, may be readily removed when broken and in order thatthe-bolts usually employed for uniting the two jaws may also be readllyremoved whenbroken and newonessubstituted, I employ-bolts 6, (see Fig.4,) provided with screw-threads removed from their heads and next theiropposite extremities orvpoints.

The face-plate of the clamp is'provided with countersinks at theinner-'face of itsiiangeV or lip,through which the bolts' pass, andVthence throughperforationsin the movable jaw, nuts 7, working onprojecting'endsof these bolts, serving to tighten the' movable jaw onVthe gang of cuttersconned between thisjaw and the sliding jaw. By thisconstruction andarrangement of the bolts it is obvious that when brokenthe head end may be readily pushed or punched out of the sliding jaw,and ,that as they do not screw into the movable jaw the other ends maybe as readily removed. The head end of the broken bolt may be dropped orreadily pushed out'of the. baseplate of the xed jaw and the projectingor nut end of said bolt be readily grasped and .unscrewed from thesliding jaw, if screwed therein, though in practice there are preferablyno screw-threads in the sliding jaw, and, as a result, this end of thebolt may likewise be dropped or easily pulled out of the sliding Y aw. JI-laving described my invention, what I claim, and desire to secure byLetters Patent, 1s-

1. In a stone-channeling machine, the combination, with the gangs ofdrills, of a clamp therefor, the sliding but' otherwise fixed jaw ofwhich is composed of a face and back plate removably dovetailedtogether, and' an actuating-arm connected with the back plate,substantially as described. n g

2. In a stone-channeling machine, th'e'combination, with the gangs 'ofdrills, of aclamp therefor having a ii'xed jaw composed of two partsremovably dovetailed toge'theigand a pin projecting through and lockingsaid twoparts against a longitudinal movement along their dovetailedconnection, substantially as de-h scribed. j

3. In a stone-channeling machine, the com'- bnation, With the gangs ofcutters and a slot;

IOO

'red bed-plate, of the face-plate 2, having a fits, and a, removable jawSecured to said facedovetaii tenen and being provided at both plantevfor clamping the cutters Johereto, suhends of its rear side withoffsets, the hasestantially as set forth. plate 3, overlapping saidoffsets, so as to form 5 therewith channels for the reception of theWitnesses:

edges of the bed-plate, and said base-plate l CHARLES C. DUNN, having aldovetail groove in which said tenon A FRANK MOORE.

ZABBY LAs'soR.

